Acoustic pressure induced period-doubling bifurcations in tympanic membrane oscillations

Усанов, Д. А.; Мареев, О. В.; Skripal, A. V.; Мареев, Г. О.; Kamyshanskii, A. S.

doi:10.1134/s1063785007110144

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…It has been observed in EAC SPL measurements for loud tonal stimulation (> 140 dB SPL in humans, 95 dB SPL in guinea pigs) (von Gierke 1950), is perceived by humans for 140 dB SPL tone presentation (Eldredge 1951), and has been reported in intracochlear pressure measurements in gerbils (Huang et al 2012). This distortion is hypothesized to originate from asymmetric stiffness in the tympanic membrane (Pong and Marcaccio 1963), and not an active middle ear process, as subharmonics were observed in pig temporal bones (Usanov et al 2007). No substantial subharmonic distortion is observed in these low frequency responses, thus these results suggest that the generation of subharmonics is a largely high-frequency phenomenon.…”

Section: Discussionmentioning

confidence: 99%

Stapes displacement and intracochlear pressure in response to very high level, low frequency sounds

et al. 2017

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The stapes is held in the oval window by the stapedial annular ligament (SAL), which restricts total peak-to-peak displacement of the stapes. Previous studies have suggested that for moderate (< 130 dB SPL) sound levels intracochlear pressure (PIC), measured at the base of the cochlea far from the basilar membrane, increases directly proportionally with stapes displacement (DStap), thus a current model of impulse noise exposure (the Auditory Hazard Assessment Algorithm for Humans, or AHAAH) predicts that peak PIC will vary linearly with DStap up to some saturation point. However, no direct tests of DStap, or of the relationship with PIC during such motion, have been performed during acoustic stimulation of the human ear. In order to examine the relationship between DStap and PIC to very high level sounds, measurements of DStap and PIC were made in cadaveric human temporal bones. Specimens were prepared by mastoidectomy and extended facial recess to expose the ossicular chain. Measurements of PIC were made in scala vestibuli (PSV) and scala tympani (PST), along with the SPL in the external auditory canal (PEAC), concurrently with laser Doppler vibrometry (LDV) measurements of stapes velocity (VStap). Stimuli were moderate (~100 dB SPL) to very high level (up to ~170 dB SPL), low frequency tones (20–2560 Hz). Both DStap and PSV increased proportionally with sound pressure level in the ear canal up to approximately ~150 dB SPL, above which both DStap and PSV showed a distinct deviation from proportionality with PEAC. Both DStap and PSV approached saturation: DStap at a value exceeding 150 μm, which is substantially higher than has been reported for small mammals, while PSV showed substantial frequency dependence in the saturation point. The relationship between PSV and DStap remained constant, and cochlear input impedance did not vary across the levels tested, consistent with prior measurements at lower sound levels. These results suggest that PSV sound pressure holds constant relationship with DStap, described by the cochlear input impedance, at these, but perhaps not higher, stimulation levels. Additionally, these results indicate that the AHAAH model, which was developed using results from small animals, underestimates the sound pressure levels in the cochlea in response to high level sound stimulation, and must be revised.

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Section: Discussionmentioning

confidence: 99%

Stapes displacement and intracochlear pressure in response to very high level, low frequency sounds

et al. 2017

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Subharmonic Distortion in Ear Canal Pressure and Intracochlear Pressure and Motion

Huang

Dong

Olson

2012

JARO

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When driven at sound pressure levels greater than ~110 dB stimulus pressure level, the mammalian middle ear is known to produce subharmonic distortion. In this study, we simultaneously measured subharmonics in the ear canal pressure, intracochlear pressure, and basilar membrane or round window membrane velocity, in gerbil. Our primary objective was to quantify the relationship between the subharmonics measured in the ear canal and their intracochlear counterparts. We had two primary findings: (1) The subharmonics emerged suddenly, with a substantial amplitude in the ear canal and the cochlea; (2) at the stimulus level for which subharmonics emerged, the pressure in scala vestibuli/pressure in the ear canal amplitude relationship was similar for the subharmonic and fundamental components. These findings are important for experiments and clinical conditions in which high sound pressure level stimuli are used and could lead to confounding subharmonic stimulation.

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Mathematical Model of Polyharmonic Signal Processing to Study the State of the Tympanic Membrane

Драган

Bogomolov

Kondrateva

2016

2016 International Conference on Engineering and Telecommunication (EnT)

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Acoustic pressure induced period-doubling bifurcations in tympanic membrane oscillations

Cited by 3 publications

References 2 publications

Stapes displacement and intracochlear pressure in response to very high level, low frequency sounds

Stapes displacement and intracochlear pressure in response to very high level, low frequency sounds

Subharmonic Distortion in Ear Canal Pressure and Intracochlear Pressure and Motion

Mathematical Model of Polyharmonic Signal Processing to Study the State of the Tympanic Membrane

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